Key chain



FIG. 1 is a perspective elevational view of a new design of a key chain;

FIG. 2 is a front elevational view;

FIG. 3 is a right side elevational view, with reference to FIG. 1, the left side elevational view being a mirror image thereof;

FIG. 4 is a rear view;

FIG. 5 is a top view; and,

FIG. 6 is a bottom view. 

The ornamental design for a key chain, as shown and described. 